denisek1

I have the small 4-cyl Frontier truck. It started running hot whenever going up a hill, or putting any kind of load on the engine. My mechanic replaced the thermonstat, same result, replaced the fan clutch, same result, replaced the rad cap, same result. Has anyone else experienced this problem?? Thanks!

jerryp58

There are a couple of other threads on "overheating", you may want to Search for them and check them out (there are ideas like "sticking brake caliper pistons" in there).

When was the last time the cooling system was flushed & filled?

How are the hoses; any chance they're collapsing under load?

How does the coolant look? There's no evidence of oil in the coolant (or coolant in the oil), is there?

If it's only when going up hill, what happens if you park on an incline with the engine running? If it overheats only in that position that makes me think of air in the system.

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Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
My Frontier Page